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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0275039edffff39f798a5bcc5efe8aa115597693c9853e27af7383c63fe2f59' 
  AND token = 'SRlXrO2ARcGCBO2L0cvBrg3u/ysICqJy6n5M5v9pu2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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