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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f92a59c4fe06eb87b6dc0ef2cea6965c55b096dde4f04bbd701623d1088ba7' 
  AND token = 'tf3ot1cfHDPljAntjN4Z+wBDX77H7Uz/1olzW0+efxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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