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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37fbadc3ebb33f5423850b82fc1ca0f224b05fcd97977ca0e3801df52cc78b7' 
  AND token = 'ZGI1rhWk7Bo7ZckrcUCf3rYEOSQItBAm/LsCs4YqJ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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