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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e69a0eae039c6a3c2c4a54d61341a8ff038da0859a49802f5985a30ecabbda' 
  AND token = '0NEpbIRYq91VANe9J+8IM7UZl2A/1ESJOcBtqk/Pg5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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