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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3111a1777bb9cd00f0c1d746e75030bacc3bc10f7e0821f284289d6af89e44d0' 
  AND token = 'ZWWSaS3dsOoQSP02RcH5iVmgytLw691HPB6Wq5YG7IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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