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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34155771b4d4a7fd18bed20b9840cf387567502c122417605a5781d9a06c799' 
  AND token = 'pacmx9xhrg4icdBQ8U0at7e6O/lMlejxLdyZ0xW6Lio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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