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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18368bca0ca71e298d74d6484b0493ec61b0d0199b98cea956d141fab6128f97' 
  AND token = 'KXj+gCNRGv2JVENCL3ChoXCG8oJzyoB0W7WFkAcqCec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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