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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c6e8c5b68085a2a87b119d2dbdbdc0f2db6c52e1365a4c8938f3471e808b80' 
  AND token = 'MV80hbDBUIECJsFAO7SNQMzU3TkPupd1RG1FXXuYEE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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