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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0e2c7c0f1d294e04c9f05958ded73804233f51c7d8b4b5e9d0e8f664bf1e1f' 
  AND token = 'yIHaNIAW7wi0WOJv0R5yQevukmyLocozg1GzUTKWY3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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