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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47cb7f203c953f72d9fc223b80642b26bd5eb4b664e4686ed2bab77d5cce983' 
  AND token = '5uN3aeA2VTJlDiqsEnd1A+uTQfYUZ5PuG2Q5+mAK84A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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