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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d47da5428863184a6b7aa983ea6f78ab1b1bb3e073e820aab766d2bfc39d24' 
  AND token = 'Ca4z59rdk4+EXHopxhOg+M7qo2uZ7fbumhd7v90MUY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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