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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd51c4116f13e3aa7ae8a7c06d3c05bb23eb8d817364fea71bda91efa8939b7c' 
  AND token = 'wt3nh8rxrg717yQ15EOZ24VTIkvNTYKKc87BcbgMZQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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