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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ba2bf519ca2862e9345bbb06697b87a3a958149e303168d3e9e0b24a8c160d' 
  AND token = 'oJ5dbLGBeEWxBGmfSrfrReC8vpPh4ygEXrYgoW3BRPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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