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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f51b59de4e875c09311ceb26fd985ae76d8e0e3b2d85a2d20731c4f1890fbb' 
  AND token = 'Y9byqC1UEcElBh/rQswfS3mOYNcxOsMf0I62PfsWaOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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