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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd5b7ebdef816b2bd11596e61cf60c29839f2272f3416663871ac73e70cdb8f' 
  AND token = 'h38MwsS8bIQSsg0F16bXa54xQSPe/PONLW8SWFkE64Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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