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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5537775a149331dca3eabac20675a3d9b8924126a1566e70dbf0507d6a5833' 
  AND token = 'SRnkTPhGb/njgrlt43RTgl6AAgMKdo52ZBKyzfqBNXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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