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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1c23365c1fe647dbac016d8ad71ee57d629dcb28fd1c4db7df9aefb4fe26e0' 
  AND token = 'I1YpcvKLGR4tDi2HNUGNOQ6nuQtRSfL1dGeBgwxqiLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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