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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e049f8bdc3f342ab838620c61ec8f4f8f23a2f8c08d65956e319809298b6087b' 
  AND token = '7mCZlU4s11/o52Y15cSmdI+8FeBnRBuWzsgS47QpbgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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