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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf94da119dad9c998b86c3c8d2698f35ee91975546c98ca9780b2fa48ad3e47d' 
  AND token = 'IlPqbzljV4Md+EBXHM0jPRADZs33zd0+IVV+lsMwANY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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