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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bd756dfd2e582300684194404935611736a6d4c04bc9a17f20d3ad27b5aa43' 
  AND token = 'gF6vtEbO49I2rRFfJh1nav4fdhsGiblLueMvv/mSF2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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