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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33adfab97c0a9fadffc44b679da629475b872d473c87d69ad389857e35c238ab' 
  AND token = 'PZ1EyC/SEVENzMMWJvffCEGNUiz1ehQlgaNyFse78Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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