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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e9327a56254cebd3e7b3587231639fcd819bf93ad4395b11262fe5b890311a' 
  AND token = 'Ka1DRBya9wl4EZ968vXFtl5q7y88g4W+jZvlXmmfcXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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