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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb20658cd75f5dc498b567755dc0a60f67d3941380c6e6ab94652625ac1ea0b' 
  AND token = 'ClnnS02ZnkL1rpZa3rBr9MaeJGCI5HQDI8c2PbSWw6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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