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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c70b50060e65410e271e5aa8cac85a9d9b8b40f569d8950d85516981f8f4271' 
  AND token = '96NIhlWMyKe65JL6/kD7kz9kr2w1photYVIAS8a25I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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