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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaada296f3314c1457280f54268e1d963f2fda252f09347a58dca7998db2ba3' 
  AND token = 'chdciGrtLtzOEFC5G2/i+tuM0Bkt2QEGHyVeqxQvWRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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