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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1060847571758cd5ad34b3c916a661a9b1c9624c711db3461f7d40b60bd5d9' 
  AND token = '+bpEU2OuPglME5X5cWlS4vN/yvYEoIRUfCAQXO7H/60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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