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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393e4b3c2ebf146cd3c05513ab3af4e42d72163f4cf7b3fe74cc3fe42a90cf4d' 
  AND token = 'WhV5iq4Alj02UWOG9fKzH/VO8F6E1a2ck+WfesZYzBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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