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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcdf81767d3d271df0dc2ba3f57be8e00e3528fead83275e49f9137ef2c302d' 
  AND token = '3IdpsQOdLql3SdFeHKb7mPWgifxIoFvx2GOlSFJtxsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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