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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5636486c971847af90ffe730c461ad4560a9ab2c6b8e0f60db3b1494c64891' 
  AND token = 'XCRuTchHhqp9Q4r4mVCytm1lwluV7nOuHW78MPQi0Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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