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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657cebdfd36acaedc4771729657bf324d139b9a52017cc2b97915a88b68c1c0a' 
  AND token = 'SAPoC1oVYrlL5SB6oLRUYzYZnf2jS7hqTQtESJ0Uua8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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