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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa77d5ecaeb02d45a5550480879e682edaf314127b5ef6e10591b6b1d2151d40' 
  AND token = 'LMJdLLv4uLdqrOtRufAoXA3XaWpxl5JNkp8yOuzWme8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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