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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1201085b81adbadc18a60207101634ce6f3c4d5d358decf99ed0e21292070e57' 
  AND token = '8U6Ndh70ho6ZQ7Qg1Vye/nJo89cLeHDMgdY2sK0G0Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}