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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd7365dba0705b066dfe3e138c82a1f1773a7ec49db615c7b8d2b6d5179fb19' 
  AND token = 'xaHsmb+r17eSrvEAHk/pWX/54cRPqyKMCdVYNPVvEAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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