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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cdf213c7019cc0d9689fd9ca7d43f30e7c72d9dda71c267cd8ded8851b002d' 
  AND token = 'LrAbrlOHHZviSZ2rv+5kwh5oRv+A/vUDf7Da6RaJ7w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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