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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2371db1c3082637c2f808c2c05184ad03493a83621353f0c38385c09dfed5eff' 
  AND token = '06RxZ2WwBh/ben+omcy+luOBPGEvSq8AwoCiUgnp+UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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