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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6c8307308764cbaf41e47fc8cab51b2244cdd39bc8b06e54d0b718f373ff12' 
  AND token = 'iuoygp60Cgn21/Yg2amOS7PCl0OxkQh4spMImYR3nvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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