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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeaeb903c05f56a638019dafa25458c83a34fdc46432806b38319bd64c1b8d7e' 
  AND token = 'N9EhHzI3dK36hw8DtttErmtHqlP95f23XyiGtOPGeYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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