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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7266cc356e41dd8f8693e69375e15719bcb81d16b1b803908d5c5ba672e896' 
  AND token = 'r66n028mK7LPrDXXg+P+9F0roe54ReKMzEr3YEKSpRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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