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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e8bc98c6e75a2a5097fb3dc86e2a4877d2d82b313b944b49b02586b9d6257b' 
  AND token = '4UW0Wo+grXL4GwMopO37C9Gd4uMnG9RQmrLR42pXjNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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