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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4236ce3b9f447a66ebc2b0ae54b2b0d0d2808a6b576507cfc4e166d5a863d3' 
  AND token = '3U3u1eI2V1C+ksceAWmdavT8fw9zvLplE3Fgn1KyGdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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