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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd310c4adfe515e9fb669bcd28c1555f20483ef549b9db32d8ebdc51a68f22276' 
  AND token = 'n8o1c9U/fFub4CRC2KJcq52O+STbp37A/YeBRuvvjQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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